K465铸造高温合金高温钎焊接头的显微组织  

Microstructures of High Temperature Brazed Joints of Cast Superalloy K465

作　　者：梁海[1] 毛唯[1] 孙计生[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《材料工程》2005年第9期7-10,15,共5页Journal of Materials Engineering

摘　　要：采用一种含有铝、钛活性元素的镍基高温钎料,对K465镍基铸造高温合金在1220℃进行了高温真空钎焊实验,通过光镜、扫描电镜和能谱分析研究分析了不同钎焊间隙和焊后热处理状态下的钎焊接头组织.研究表明0.1～0.2mm钎焊间隙的钎缝组织由(γ+γ′)共晶、呈块状、骨架状或羽毛状和不规则形状的化合物相和γ固溶体组成;0.35mm间隙中填充镍网的钎缝组织,主要由大量γ枝晶、少量(γ+γ′)共晶和少量的化合物相组成.钎焊接头间隙在0.1～0.2mm时钎焊后固溶热处理不能明显消除有害化合物相;而接头添加镍网可明显改善接头组织,减少有害化合物相,提高固溶热处理的效果.An experimental investigation of high temperature vacuum brazing at 1220℃ of nickel-based cast superalloy K465 was performed by using a type of nickel-based high temperature active brazing filler metal bearing aluminum and titanium elements. The microstructures of brazed joints with different clearances and post-braze heat treatment conditions were analyzed by optical microscope, SEM and EDS. The investigation shows that the structure of brazing seam with 0.1 -0.2mm clearance consists of （γ＋γ＇） eutectic, compounds in blocky, Chinese script or feathery and irregular forms, and γ solid solution. The structure of brazing seam with nickel mesh addition to the brazing clearance primarily consists of a large amount of γ dendrite, a small quantity of （γ＋γ＇） eutectic and compounds. Postbraze heat treatment was not apparently able to eliminate detrimental compounds in the brazing seam with 0.1-0.2mm clearance, but with nickel mesh addition to the braze clearance, resulting in consid- erable improvement of brazed joint structure, reduction of detrimental compounds and significant postbraze heat treatment effects.

关 键 词：铸造高温合金 高温钎焊 活性钎料 接头组织 γ’相 

分 类 号：TG146.15[一般工业技术—材料科学与工程]